Comparison of Tests on Air Propellers in Flight with Wind Tunnel Model Tests on Similar Forms
This is a 1926 NACA technical report from the NASA Technical Reports Server, comparing in-flight propeller test results with wind tunnel model tests for engineers and aerodynamicists. Its pictures are dense black-and-white engineering drawings: propeller blade outlines with dimensioned sections, a page of small lift and drag coefficient curve graphs, and plots of lift coefficient against drag coefficient and angle of attack with scattered test points. A designer could draw on their clean technical line work, tabular grid layouts, and the restrained chart typography of early aeronautical reports.
